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  • 1
    Digitale Medien
    Digitale Medien
    Derivation of a kinetic equation with applications to MBE
    Amsterdam : Elsevier
    Physics Letters A 162 (1992), S. 346-350 
    Details
    ISSN: 0375-9601
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(92)90029-L
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  • 2
    facet.materialart.
    Unbekannt
    The MU-RAY project: Volcano radiography with cosmic-ray muons (2012)
    Elsevier Science Limited
    Details
    Publikationsdatum: 2023-01-25
    Beschreibung: Cosmic-ray muon radiography is a technique for imaging the variation of density inside the top few 100m of a volcanic cone. With resolutions up to 10s of meters in optimal detection conditions, muon radiography can provide images of the top region of a volcano edifice with a resolution that is considerably better than that typically achieved with conventional methods. Such precise measurements are expected to provide us with information on anomalies in the rock density distribution, like those expected from dense lava conduits, low density magma supply paths or the compression with depth of the overlying soil. The MU-RAY project aims at the construction of muon telescopes and the development of new analysis tools for muon radiography. The telescopes are required to be able to work in harsh environment and to have low power consumption, good angular and time resolutions, large active area and modularity. The telescope consists of two X–Y planes of 2x2 square meters area made by plastic scintillator strips of triangular shape. Each strip is read by a fast WLS fiber coupled to a silicon photomultiplier. The readout electronics is based on the SPIROC chip.
    Beschreibung: Published
    Beschreibung: 120-123
    Beschreibung: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Muon radiography ; Volcano structure ; Silicon photomultiplier ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 3
    facet.materialart.
    Unbekannt
    The MU-RAY project: Summary of the round-table discussions (2010)
    TERRA SCIENTIFIC PUBL CO
    Details
    Publikationsdatum: 2023-01-25
    Beschreibung: The MU-RAY project has the challenging aim of performing muon radiography of the summit cone of Mt. Vesuvius. The muon telescopes developed for this purpose will be available for the radiography of other volcanoes, in particular Stromboli. The scientific goals, the strategy for their implementation and the baseline detector design are discussed in detail. A tentative time schedule for the project is drawn.
    Beschreibung: Published
    Beschreibung: 145–151
    Beschreibung: 3.6. Fisica del vulcanismo
    Beschreibung: JCR Journal
    Beschreibung: reserved
    Schlagwort(e): Muon ; radiography ; volcanoes ; 04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole, radioactivity, remote sensing, and other methods ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 05. General::05.04. Instrumentation and techniques of general interest::05.04.99. General or miscellaneous
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 4
    Digitale Medien
    Digitale Medien
    Transverse spin freezing in the vicinity of amorphous Fe (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 7139-7141 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Temperature dependence of magnetism in the vicinity of the ferromagnetic instability point of amorphous Fe has been investigated on the basis of the finite temperature theory of amorphous metallic magnetism which takes into account the transverse spin degrees of freedom. The theory is based on the functional integral technique to the degenerate-band Hubbard Hamiltonian and the distribution function method for local magnetic moments with structural disorder. Numerical calculations have been performed with decreasing temperature near the boundary between the ferromagnetic and the spin glass phases. It is shown that the amorphous metals around Fe exhibit the transition from the collinear to the noncollinear ferromagnetic state at a temperature lower than the Curie temperature, due to the freezing of transverse spin components. The present results are consistent with those of recent Mössbauer measurements on Fe-rich amorphous transition metal alloys. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372956
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  • 5
    Digitale Medien
    Digitale Medien
    Finite temperature theory of noncollinear magnetism in amorphous Fe : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3859-3861 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Noncollinear magnetism in the vicinity of amorphous Fe has been investigated by developing the finite temperature theory of amorphous metallic magnetism which takes into account the transverse spin fluctuations. The theory is based on the functional integral technique to the degenerate-band Hubbard Hamiltonian with Hund's rule coupling and the distribution function method for local magnetic moments with structural disorder. It is shown that an isotropic spin-glass is realized in amorphous Fe, by taking into account the transverse components of local magnetic moments. The origin of the spin-glass around amorphous Fe is explained by the nonlinear magnetic couplings between Fe local moments and the local environment effects on the amplitude of Fe local moments. When the d electron number N is increased, the isotropic spin-glass changes to a noncollinear ferromagnet at N=7.40 and finally changes to a collinear ferromagnet beyond N=7.47 at 35 K. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.364733
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  • 6
    Digitale Medien
    Digitale Medien
    Exchange fields at rare-earth sites in Rn+1Co3n+5B2n (R=Gd and Dy) compounds : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5141-5143 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Spontaneous magnetization and paramagnetic susceptibility have been measured for the Rn+1Co3n+5B2n compounds with R=Y, Gd, and Dy and n=1, 2, and 3 in the temperature range from 4.2 up to 1000 K in fields up to 20 kOe. The data on the Gd system are analyzed based on the molecular field model. The exchange field at the Gd site from the Co sublattice is estimated. The averaged exchange field at T=0 K is estimated to be 101 T for n=1, 75T for n=2, and 56 T for n=3. Paramagnetic susceptibilities are fairly well expressed by the superposition of the Co- and the Gd-sublattice contributions. Other magnetic properties of the Y and the Gd system are also reported. Only magnetic data are given for the Dy system. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365149
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  • 7
    Digitale Medien
    Digitale Medien
    Directional growth of copper phthalocyanine crystal by selective chemical vapor deposition method (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1367-1369 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Novel deposition behavior was observed when 1,4-dicyanobenzene was sublimed onto copper micropatterns on silicon wafer. On the patterns copper-phthalocyanine whiskers and debris of similar size were formed and preferentially oriented along or perpendicular to the copper lines. The directional growth was confirmed to have nothing to do with crystal axis of the silicon, but was considered to be due to the periodic structure of the copper lines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112054
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  • 8
    Digitale Medien
    Digitale Medien
    Reflection noise in vertical cavity surface emitting lasers (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 1480-1482 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We describe the effect of back reflections on the relaxation-oscillation peaks of low threshold (〈6 mA), high intrinsic bandwidth (31 GHz) vertical cavity surface emitting lasers. With the largest feedback possible with our experimental arrangement, x=−5.8 dB, the relaxation-oscillation peak breaks up into a series of sharp resonances with the spacing corresponding to the round tip frequency of the external cavity. In contrast to edge emitting lasers, no effect of reflections is observed for feedback levels x〈−12.9 dB. This relative immunity of vertical cavity lasers to reflection noise is expected to be of interest for their applications to fiber communications.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.109662
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  • 9
    Digitale Medien
    Digitale Medien
    Spontaneous emission factor and its scaling in vertical cavity surface emitting lasers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1062-1064 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report room-temperature measurements of the spontaneous emission factor β in high-quality gain-guided GaAs/AlGaAs vertical cavity surface emitting lasers. In devices with 6-μm diameter we obtain β=2.8×10−3. The measured scaling of β with the cavity volume agrees well with classical electromagnetic model of dipole radiation. The magnitude of β exceeds that predicted by classical theory by approximately a factor of 2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.110932
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  • 10
    Digitale Medien
    Digitale Medien
    Photocurrent spectroscopy of Bragg mirrors in vertical cavity surface emitting lasers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 400-402 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We describe a simple technique to precisely measure the reflectivity spectra of the Bragg mirrors in individual vertical cavity surface emitting lasers. Detailed reflectivity spectra are obtained by measuring the response of the active layer junction to light impinging upon the output mirror, corrected by the active layer response spectrum. Precise measurements of the emission spectrum of the laser with respect to the Fabry–Perot notch are then possible. In the temperature range of 20–100 °C we measure the rates of 0.56 and 0.62A(ring)/°C for the mirror stack and the lasing wavelength, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.111160
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